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.\" Copyright (c) 2005 Robert N. M. Watson
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 7, 2005
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.Os
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.Dt SCHED_ULE 4
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.Sh NAME
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.Nm sched_ule
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.Nd ULE Scheduler
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.Sh SYNOPSIS
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.Cd "options SCHED_ULE"
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.Sh DESCRIPTION
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2005-06-16 18:46:17 +00:00
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The
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.Nm
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scheduler
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is an experimental scheduler that provides a number of advanced scheduler
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features not present in
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.Xr sched_4bsd 4 ,
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the default system scheduler.
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These features address SMP and interactivity and include:
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.Pp
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.Bl -bullet -compact -offset indent
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.It
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Thread CPU affinity.
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.It
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CPU topology awareness, including for hyper-threading.
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.It
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Per-CPU run queues.
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.It
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Interactivity heuristics that detect interactive applications and schedules
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them preferentially under high load.
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.El
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.Pp
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The following sysctls are relevant to the operation of
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.Nm :
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.Bl -tag -width indent
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.It Va kern.sched.name
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This read-only sysctl reports the name of the active scheduler.
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.El
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.Pp
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The
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.Nm
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scheduler
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is disabled by default as it is experimental.
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See the
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.Sx BUGS
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section for more information.
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.Sh SEE ALSO
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.Xr sched_4bsd 4 ,
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2006-06-14 02:16:51 +00:00
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.Xr sched_core 4 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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scheduler first appeared in
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.Fx 5.1 .
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.Sh AUTHORS
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.An Jeff Roberson
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.Aq jeff@FreeBSD.org
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.Sh BUGS
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As an experimental scheduler,
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.Nm
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is not enabled by default due to a number of known issues, including weak
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performance with several known workloads, and reports of instability.
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Deployment of
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.Nm
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in production environments should be done cautiously.
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